Search found 951 matches

by p_zetner
Mon Sep 16, 2019 1:57 pm
Forum: This is SolarChat !!
Topic: 14 May 2019 Spectroheliograms
Replies: 15
Views: 166

Re: 14 May 2019 Spectroheliograms

Thanks very much, Alexandra!

All the best to you.
Peter
by p_zetner
Sun Sep 15, 2019 3:22 am
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 14May2019 Spectroheliograms: H alpha
Replies: 2
Views: 59

Re: 14May2019 Spectroheliograms: H alpha

Hi Mark. So far, I haven’t used any front filtering on the C4 but I’m thinking about it. In the previous incarnation of this SHG, I used a Rubinar 100mm f/10 which had some cemented field correcting lenses at the back end. I used a 100mm x 100mm Schneider IR-UV cut filter to try and reduce the therm...
by p_zetner
Thu Sep 12, 2019 9:31 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: 14May2019 Spectroheliograms: H alpha
Replies: 2
Views: 59

14May2019 Spectroheliograms: H alpha

Hi Everyone. I've posted a teaser collage of the Sun in four wavelengths in the main forum. https://solarchatforum.com/viewtopic.php?f=4&t=26584&p=239629#p239629 I thought I would add some more images here and start with H alpha. The first three images are, in order, full disk H alpha spectroheliogr...
by p_zetner
Thu Sep 12, 2019 9:09 pm
Forum: This is SolarChat !!
Topic: 14 May 2019 Spectroheliograms
Replies: 15
Views: 166

Re: 14 May 2019 Spectroheliograms

Dear Frank, Phil, Valery, Mark, Stu, Eric and Maurits; Thanks all for your kind thoughts and supportive words. Eric, you may be right about the healing power of solar astronomy! Stu, I'll do my best to stick around for a few more solar cycles. I have projects I have to finish! Thanks again and all t...
by p_zetner
Wed Sep 11, 2019 8:37 pm
Forum: This is SolarChat !!
Topic: 14 May 2019 Spectroheliograms
Replies: 15
Views: 166

Re: 14 May 2019 Spectroheliograms

Marty, Franco and Pedro; Thanks for the very kind wishes.
It’s good to be among the living, hopefully long enough to outlast solar minimum!
by p_zetner
Wed Sep 11, 2019 6:40 pm
Forum: This is SolarChat !!
Topic: 14 May 2019 Spectroheliograms
Replies: 15
Views: 166

14 May 2019 Spectroheliograms

Greetings Everyone. These spectroheliograms are a bit late in coming . They were taken in May when we had the rare pleasure of the large sunspot and active region AR2741. The disk orientation is wrong - probably inverted left to right. In the intervening time, I had the opportunity to do some travel...
by p_zetner
Sun Aug 25, 2019 12:55 pm
Forum: This is SolarChat !!
Topic: Saturday Sun Aug 24th
Replies: 13
Views: 193

Re: Saturday Sun Aug 24th

Very nice views, Stu.
Superb work on the granulation images.
Cheers.
Peter
by p_zetner
Sun Aug 25, 2019 12:53 pm
Forum: This is SolarChat !!
Topic: Descending Prominence Knots and Coronal Rain - 23rd August
Replies: 20
Views: 252

Re: Descending Prominence Knots and Coronal Rain - 23rd August

Superb animation and terrific post, Mark.
Cheers.
Peter
by p_zetner
Wed Jun 12, 2019 5:29 pm
Forum: Solar Radio, Magnetometry and Spectroscopy
Topic: can someone explain double reversal?
Replies: 3
Views: 316

Re: can someone explain double reversal?

Hi John.

I replied to your question here:
https://www.cloudynights.com/topic/6645 ... nd-k-line/

I also addressed the nature of the double reversal on the SolarChat forum:
viewtopic.php?f=8&t=12329
(Near the end of the thread.)

Cheers.
Peter
by p_zetner
Tue May 21, 2019 4:26 pm
Forum: This is SolarChat !!
Topic: May 17: AR2741 and proms in H alpha
Replies: 6
Views: 335

May 17: AR2741 and proms in H alpha

Hi Everyone. Saying goodbye to AR2741! High resolution image: Aries ERF, Celestron C8 Edge, Moonlite CHL focuser, ~f/46 Telecentric, Daystar QPE 0.6A, PGR USB3 Grasshopper IMX174 Mosaic (4 panels): Aries ERF, Celestron C8 Edge, Moonlite CHL focuser, ~f/46 Telecentric, Daystar QPE 0.6A, ~f/30 FR, PGR...
by p_zetner
Fri May 17, 2019 2:21 am
Forum: This is SolarChat !!
Topic: AR12741 at it's full opening in H-a and CaK high resolution with C11 and C8 scopes.
Replies: 7
Views: 441

Re: AR12741 at it's full opening in H-a and CaK high resolution with C11 and C8 scopes.

Astonishing imaging, Valery.

Look at the details in the light bridge! You give adaptive optics a run for its money.
I can’t believe you were able to stack 3000 / 4000 frames! Were these “real time” quality selected by SSM?

Cheers.
Peter
by p_zetner
Fri May 17, 2019 1:56 am
Forum: This is SolarChat !!
Topic: AR2741 High Res, Proms | HA, WL, CaK | May 15th 2019
Replies: 7
Views: 405

Re: AR2741 High Res, Proms | HA, WL, CaK | May 15th 2019

Another nice collection, Marty.
You really manage to get the most out of a session!

Cheers.
Peter
by p_zetner
Fri May 17, 2019 1:48 am
Forum: This is SolarChat !!
Topic: AR2741 2019/5/16
Replies: 5
Views: 346

Re: AR2741 2019/5/16

Another excellent view of the AR, Pepe.
The prom shot looks good too.

Cheers.
Peter
by p_zetner
Fri May 17, 2019 1:44 am
Forum: This is SolarChat !!
Topic: Close to AR2741 ... Quark Prominence ... UPDATE
Replies: 13
Views: 638

Re: Close to AR2741

Beautiful shots, Maurits.

I love inverted disk views. I don’t know whether it’s psychological but they seem to reveal more detail.

Cheers.
Peter
by p_zetner
Fri May 17, 2019 1:41 am
Forum: This is SolarChat !!
Topic: May 15 H alpha and May 10 CaK
Replies: 11
Views: 532

Re: May 15 H alpha and May 10 CaK

Thanks everyone. Here I thought the gods of meteorology were just picking on me! A hazard of the hobby, clearly! (Hmmm....”clearly”...) Bart: I’ve been very lazy about recording my exposure settings lately. The CaK shots are probably around 5ms. I try to keep it as short as possible without boosting...
by p_zetner
Thu May 16, 2019 11:14 pm
Forum: This is SolarChat !!
Topic: Thursdays Hazy Start to the Day - 16th May
Replies: 11
Views: 526

Re: Thursdays Hazy Start to the Day - 16th May

Nice shots, Mark. They do stand up well under magnification.
@RodAstro: I wonder if a little haze is beneficial. It does seem to be associated with less turbulence. In the end, though, I guess there is some sacrifice of fine detail.
Cheers.
Peter
by p_zetner
Wed May 15, 2019 5:23 pm
Forum: This is SolarChat !!
Topic: May 15 H alpha and May 10 CaK
Replies: 11
Views: 532

May 15 H alpha and May 10 CaK

Hi Everyone. I should have paid more attention to the weather forecast. The day began with beautiful clear skies (not a cloud in sight) so I began the process of gearing up for an imaging session. I set up the C8 scope and, as the Daystar came to temperature and the Sun cleared the neighbour's tree,...
by p_zetner
Wed May 15, 2019 5:08 pm
Forum: This is SolarChat !!
Topic: AR2741 2019/5/15
Replies: 5
Views: 295

Re: AR2741 2019/5/15

Beautiful images, Pepe.
I like your idea of showing the increased exposure image to reveal structures in the spot.
Cheers.
Peter
by p_zetner
Wed May 15, 2019 1:12 pm
Forum: This is SolarChat !!
Topic: Sunday sunshine 12th May
Replies: 10
Views: 435

Re: Sunday sunshine 12th May

Wow, the H alpha closeups are terrific, Alexandra.
The double stacking really produces a nice result.
Hope your little Grasshopper returns home soon!
Cheers.
Peter
by p_zetner
Wed May 15, 2019 2:05 am
Forum: This is SolarChat !!
Topic: Always to see something ...
Replies: 9
Views: 416

Re: Always to see something ...

Very nice image, Maurits.
Cheers.
Peter
by p_zetner
Wed May 15, 2019 1:55 am
Forum: This is SolarChat !!
Topic: AR2741 & AR2740, Large Prominence | HA & CaK | May 14th 2019
Replies: 5
Views: 316

Re: AR2741 & AR2740, Large Prominence | HA & CaK | May 14th 2019

Lovely set, Marty.
Lots of detail in the closeup even though it’s “only” 120mm aperture!
Cheers.
Peter
by p_zetner
Tue May 14, 2019 5:58 pm
Forum: This is SolarChat !!
Topic: AR2741 with 250mm RCT
Replies: 14
Views: 599

Re: AR2741 with 250mm RCT

Excellent image, Stu.
Looks like great potential for hi-res images with that scope.
Cheers.
Peter
by p_zetner
Tue May 14, 2019 1:31 am
Forum: This is SolarChat !!
Topic: Sol from the 13th of May 2019.
Replies: 8
Views: 337

Re: Sol from the 13th of May 2019.

52 years! Wow!! Congratulations, Eric. That’s quite something.
(You really managed to produce some beautiful disks also, despite the conditions.)
Cheers.
Peter
by p_zetner
Mon May 13, 2019 10:16 pm
Forum: This is SolarChat !!
Topic: Slim pickings 13/5/2017 Tal/PST mod
Replies: 8
Views: 371

Re: Slim pickings 13/5/2017 Tal/PST mod

Nice details in the surface shot.
Cheers.
Peter
by p_zetner
Mon May 13, 2019 10:12 pm
Forum: This is SolarChat !!
Topic: May 12th Spots and Proms
Replies: 7
Views: 315

Re: May 12th Spots and Proms

Terrific set!
I have to remember to be smarter next time and capture some continuum images while the Daystar is heating up.
(I’m assuming that’s how you took the first image.)
Cheers.
Peter